ST:
my central point is that the current chances that some people here could become e-sporters are currently next to minus infinite because there is currently no demand for such an offer. Frankly, the lack of demand should mostly hinge on the fact that capitalist ventures have not created so far: if people don't want a product, companies will find a way to create the craving (e.g. any type of processed/junk food).
The list of sports I mentioned is not casual: Association Football is one of the two truly global sports, the other being basketball, and has global appeal even if matches can often end in no goals being scored, rules are often obscure and counter-intuitive (e.g. off-side, no use of hands), and some
winning strategies like "Tiki Taka" result in absurdly boring matches.
Any European (male, usually) will however tell you that football is highly entertaining because it gives them a way to be tribal and cheer for their favourite team or boo the other team (and, for hooligans, start completely pointless fights). The kazillions of money that teams spend on players also tend to excite fans, I believe. Actual action on the pitch? I cannot find statistics, but I wonder if it matters beyond winning.
(Maybe) stranger things have happened: in Tennis, it was all because of
Rod Laver. Still, some people here seem to navigate to their '50s and indulge in Walter Mitty fantasies that are...
a known phenomenon in psychology (this
one is also free).
I believe that the original OP should be Chinese, a country in which E-sports went from "basically illegal" to "state-sanctioned profession" (too lazy to check links). The market (here) in China is huge and I can watch people streaming
King Of Fighters matches 24/7 on WeChat TV (one channel per title, with '98 usually having multiple channels). My colleagues from slightly younger generations (below 40, I am 44) go to public events when possible, but for LoL and similar titles. I guess that his post/question was influenced by this context, not by an *actual* understanding of how e-sports (and capitalism) work.
"Shmup professional players"...lads, please. I mean, please keep going because I am larfing my ass off while I type this

I am very happy if the guys you mention can actually make a profit of their organisational efforts with shmups, and I wish that their success will increase over time, to be fair. Maybe one day they'll find the winning formula for the masses, or a niche big enough to actually be profitable for many.
EDIT:
I just recalled that the E-sports (association) football team for Italy is paid by the Italian football federation (i.e. the guys administering the "real" professional sport), and roguhly 71% of Italian athletes at the Olympics were from military corps (e.g. people paid to train and compete in sports). I think that a pitch for videogames at the Olympics could raise the chances of e.g. the navy forming a "shmup players battalion" to win the cold war of medals
P.S.
A nice bit I found on
Escapism. I am guilty as charged of it, but self-deprecation is a subtle art easily misunderstood on the intarwebs.
P.P.S.
Can shmups be made appealing to the masses? My meme-tastic answer is that corporate overlords may one day say (first time I have ever inserted an image):

"The only desire the Culture could not satisfy from within itself was one common to both the descendants of its original human stock and the machines [...]: the urge not to feel useless."
I.M. Banks, "Consider Phlebas" (1988: 43).